<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        #d1{
            width: 200px;
            height:200px;
            border-left: 10px solid red;

            border-right: groove 100px ;
            border-radius: 200px;
        }
        #d2{
            width:15px;
            height: 15px;
            border: 1px solid red;
            padding-left:50px;
            padding-top: 50px;
            box-sizing: border-box;
        }
    </style>
</head>
<body>

<div id="d2">内边距</div>
<div id="d1">边框测试</div>
</body>
</html>